playback.cpp File Reference

#include <memory>
#include <string_view>
#include "debug.h"
#include "module.h"
#include "audio/audio_filter.h"
#include "audio/types.h"
#include "audio/audio_playback.h"
#include "lib_common.h"
#include "utils/string_view_utils.hpp"
#include "utils/misc.h"

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Classes
struct	state_playback

Functions
static af_result_code	configure (void *state, int in_bps, int in_ch_count, int in_sample_rate)
static void	done (void *state)
static af_result_code	filter (void *state, struct audio_frame **frame)
static void	get_configured (void *state, int *bps, int *ch_count, int *sample_rate)
static af_result_code	init (struct module *parent, const char *cfg, void **state)
static af_result_code	parse_cfg (state_playback *s, std::string_view cfg)
	REGISTER_MODULE (playback, &audio_filter_playback, LIBRARY_CLASS_AUDIO_FILTER, AUDIO_FILTER_ABI_VERSION)
static void	usage ()

Variables
static const struct audio_filter_info	audio_filter_playback

Detailed Description

Author

Martin Piatka piatk.nosp@m.a@ce.nosp@m.snet..nosp@m.cz

Definition in file playback.cpp.

Function Documentation

configure()

static af_result_code configure ( void * state, int in_bps, int in_ch_count, int in_sample_rate )

static

Definition at line 105 of file playback.cpp.

{
        auto s = static_cast<state_playback *>(state);
 
        s->bps = in_bps;
        s->ch_count = in_ch_count;
        s->sample_rate = in_sample_rate;
 
        if (audio_playback_reconfigure(s->playback_dev.get(), s->bps * 8,
                                s->ch_count,
                                s->sample_rate) != TRUE) {
                return AF_FAILURE;
        }
 
        return AF_OK;
}

References AF_FAILURE, AF_OK, audio_playback_reconfigure(), state_playback::bps, state, and TRUE.

Referenced by filter().

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done()

static void done ( void * state )

static

Definition at line 123 of file playback.cpp.

                             {
        auto s = static_cast<state_playback *>(state);
 
        delete s;
}

References state.

filter()

static af_result_code filter ( void * state, struct audio_frame ** frame )

static

Definition at line 139 of file playback.cpp.

                                                                     {
        auto s = static_cast<state_playback *>(state);
 
        struct message *msg;
        while ((msg = check_message(s->mod.get()))) {
                const char *text = ((msg_universal *) msg)->text;
                if(parse_cfg(s, text) != AF_OK){
                        free_message(msg, new_response(RESPONSE_BAD_REQUEST, nullptr));
                        continue;
                }
 
                free_message(msg, new_response(RESPONSE_OK, nullptr));
        }
 
        auto f = *frame;
 
        if(f->bps != s->bps || f->ch_count != s->ch_count || f->sample_rate != s->sample_rate){
                if(configure(state, f->bps, f->ch_count, f->sample_rate) != AF_OK){
                        return AF_MISCONFIGURED;
                }
        }
 
        audio_playback_put_frame(s->playback_dev.get(), f);
 
        return AF_OK;
}

References AF_MISCONFIGURED, AF_OK, audio_playback_put_frame(), check_message(), configure(), frame, free_message(), msg, new_response(), parse_cfg(), RESPONSE_BAD_REQUEST, RESPONSE_OK, and state.

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get_configured()

static void get_configured ( void * state, int * bps, int * ch_count, int * sample_rate )

static

Definition at line 129 of file playback.cpp.

{
        auto s = static_cast<state_playback *>(state);
 
        if(bps) *bps = s->bps;
        if(ch_count) *ch_count = s->ch_count;
        if(sample_rate) *sample_rate = s->sample_rate;
}

References state_playback::bps, sample_rate, and state.

init()

static af_result_code init ( struct module * parent, const char * cfg, void ** state )

static

Definition at line 95 of file playback.cpp.

                                                                                {
        auto s = std::make_unique<state_playback>(parent);
 
        auto ret = parse_cfg(s.get(), cfg);
        if(ret == AF_OK)
                *state = s.release();
 
        return ret;
};

References AF_OK, parent, parse_cfg(), and state.

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parse_cfg()

static af_result_code parse_cfg ( state_playback * s, std::string_view cfg )

static

Definition at line 80 of file playback.cpp.

                                                                      {
        auto tok = tokenize(cfg, ':');
        if(tok.empty() || tok == "help"){
                usage();
                return AF_HELP_SHOWN;
        } 
 
        auto dev = std::string(tok);
        auto dev_cfg = std::string(tokenize(cfg, ':'));
 
        int ret = audio_playback_init(dev.c_str(), dev_cfg.c_str(), out_ptr(s->playback_dev));
 
        return ret == 0 ? AF_OK : AF_FAILURE;
}

References AF_FAILURE, AF_HELP_SHOWN, AF_OK, audio_playback_init(), state_playback::playback_dev, tokenize(), and usage().

Referenced by filter(), and init().

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REGISTER_MODULE()

REGISTER_MODULE	(	playback	,
		&	audio_filter_playback,
		LIBRARY_CLASS_AUDIO_FILTER	,
		AUDIO_FILTER_ABI_VERSION	)

usage()

static void usage ( void )

static

Definition at line 74 of file playback.cpp.

                   {
        printf("Plays audio using an UltraGrid playback device:\n\n");
        printf("playback usage:\n");
        printf("\tplayback:<playback dev>:<dev config>\n\n");
}

Referenced by parse_cfg().

Variable Documentation

audio_filter_playback

const struct audio_filter_info audio_filter_playback

static

Initial value:

= {
        .name = "playback",
        .init = init,
        .done = done,
        .configure = configure,
        .get_configured_in = get_configured,
        .get_configured_out = get_configured,
        .filter = filter,
}

Definition at line 166 of file playback.cpp.

                                                              {
        .name = "playback",
        .init = init,
        .done = done,
        .configure = configure,
        .get_configured_in = get_configured,
        .get_configured_out = get_configured,
        .filter = filter,
};